http://www.w3.org/Bugs/Public/show_bug.cgi?id=12544
--- Comment #9 from Mark Watson <watsonm@netflix.com> 2011-05-13 15:18:12 UTC ---
(In reply to comment #8)
> (In reply to comment #7)
> > captions - video with open ("burned in") captions
> > subtitles - video with open ("burned in") subtitles
>
> If the video track has burned in text then you can't turn it on or off, so what
> could a user agent do with this information? It seems like it would only be
> theoretically relevant in a case where you have *both* the original video and a
> version with open captions/subtitles, which must be extremely uncommon.
Yes, it's for the case where you have both, which is not uncommon. We have
material of this kind where, for whatever reason, the captions are only
available in this form and not as a separate file.
Obviously, it's only efficient if you have a transport system which only
transports the tracks being viewed over the network, which we have and for
which there are now emerging standards (e.g. DASH).
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